A Red Sox bullpen that has spent much of the season under siege was once again front and center last night in a 9-7 loss to the Angels, with concern focused on left-hander Andrew Miller.

Alex Wilson failed to protect a four-run lead in the ninth. Closer Koji Uehara blew a save when Brandon Snyder threw away a potential game-ending grounder. Craig Breslow served up the game-winning homer to Josh Hamilton in the 11th. Lost in the loss was the performance of Andrew Bailey, who earned four crucial outs before Wilson's ninth-inning collapse.

But the real story was Miller, who injured his left foot while stumbling to cover home plate, falling in a heap and grimacing in immediate pain before being helped off the field. He was taken to a hospital for X-rays, the results of which weren't immediately available.

Manager John Farrell said Miller suffered an injury to the top of his left foot and ruled out an Achilles' injury. He declined to speculate on the possibility that Miller's foot is broken.

“I can't even speculate,” Farrell said. “I don't know.”

Losing Miller, who has been a strikeout force in the back of the bullpen, would be a huge blow. He has 48 strikeouts in 30.2 innings, with a 2.64 ERA in 37 games.